Well, hydrogen does not oscillate into anti-hydrogen (in the standard model) so it may be more instructive to discuss the kaons from your previous post. Neutral kaons are combinations of ##s\bar d## and ##d\bar s##.

Well, hydrogen does not oscillate into anti-hydrogen (in the standard model) so it may be more instructive to discuss the kaons from your previous post. Neutral kaons are combinations of ##s\bar d## and ##d\bar s##.

I thought the point of the OP was to ask whether particles can transform into anti-particles. For that it is naturally necessary that the particle is different from the anti-particle. The point of #5 was to say that this does indeed happen for (some) neutral particles, but the example of #8 is not one of those cases, but the kaon is.

Another way to look at the situation is to say that the Kaon is only a particle when weak interaction is neglected, but is no longer a particle, once weak interaction is taken into account, but rather a superposition of two resonances with different lifetime. So strictly speaking, there is no transformation of a particle into its antiparticle here either.